Hello. Metal salts are better because of their solubility, stability (sometimes). If you use metal, you need to prepare a solution and it means to convert it to some soluble compound.
For AAS you can use just about anything, since interelement effects are essentially non-existent. If you were preparing standards for ICP, then I would highly recommend the use of the pure elements where possible.
Most of the branded standard solution for AAS, available in the market is prepared from metal salts. It is soluble and easy to find in very pure form.
You can by standards solution from Sigma, Fluka etc, that is easy to use
Merck, Jermany also prepare varieties of Standard solution for AAS
Metal salts give ions in aqueous form which are aspirated into the AAS flame for atomisation, thus metal salts are often used for standardisation in AAS analysis
I suggest you should go for the manufacturers standard in order to avoid a degrading/contaminated salt due to storage
If you go for a salt, you will need to do this:
Molar mass of compound (metal salt), Zn(NO₃)₂ =189.36 g/mol, Molar mass of metal in the compound (Zn in Zinc nitrate) Zn2+ = 65.38 g/mol.
1000ppm stock of Zn = Molar mass of compound/ (Molar mass of metal) = 189.36/(65.38) ≈ 2.9g.
Therefore, you need 2.9g of Zn(NO₃)₂ dissolved in 1L of water to prepare 1000ppm Zn stock solution.
100 ppm stock of Zn = Molar mass of compound/ (Molar mass of metal * 0.1L) = 189.36/(65.38*0.1) ≈ 29g.
Therefore, you need 29g of Zn(NO₃)₂ dissolved in 100mL of water to prepare 100ppm Zn stock solution.
You can also purchase a ready made standard of the metal.
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